android - how to change images on imageView after some interval -

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i have problem want paste images on imageview in android , images periodically changed after interval. means 1 one images shown in imageview. doing of thread in java got problem thread not attached , something. please review code given below , tell me exact error , how remove error or give me diffrent way doing this.

package com.ex.thread;  import com.ex.thread.r;  import android.app.activity; import android.os.bundle; import android.util.log; import android.widget.imageview;  public class thread extends activity implements runnable{ /** called when activity first created. */ public static integer[] mthumbids = {     r.drawable.al1,r.drawable.al2,r.drawable.al3,r.drawable.al4,  }; thread th; imageview iv; public void run() {     for(int i=0;i<3;i++)     {         iv.setimageresource(mthumbids[i]);         system.out.println("sanat pandey");         try{             thread.sleep(3000);         }catch(exception e)         {             system.out.println(e);         }     } } public void create() {     thread th = new thread(new thread());     th.start();     try{         thread.sleep(3000);     }catch(exception e)     {         system.out.println(e);     } }  @override public void oncreate(bundle savedinstace) {     super.oncreate(savedinstace);     setcontentview(r.layout.main);     create(); } }

you can't use things in ui thread background one. call:

iv.setimageresource(mthumbids[i]);

has done in main thread. in fact don't need background thread @ effect you're looking for. can make activity, no need implement runnable. , this:

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);     iv = (imageview) findviewbyid(r.id.yourimageviewid);     int = 0;     runnable r = runnable(){         public void run(){              iv.setimageresource(mthumbids[i]);              i++;              if(i >= mthumbids.length){                  = 0;              }              iv.postdelayed(r, 3000); //set go off again in 3 seconds.          }     };     iv.postdelayed(r,3000); // set first time 3 seconds

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